Most scented candles are made with paraffin, which gives off soot particles that are seen in diesel emissions and are known carcinogens.

The bonfire smoke contains similar noxious gases such as dioxins, carbon monoxide, nitrogen and sulphur oxides, as well as soot particles that penetrate deep into lungs, and carbon dioxide.

Now we know diesel cars emit dangerously high levels of particulates - tiny soot particles - and nitrogen oxides.

Put simply, if you can smell that lovely aroma, you are likely to be inhaling soot particles.

And they will have fewer illnesses such as cardiovascular disease and asthma as a result of less exposure to nitrogen dioxide and soot particles.